See here two screenshots from Wireshark. The capture was made on one interface on the internal proxy 10.x.x.x. When it's receiving a SIP packet from another host in the same subnet, everything is working normally.

kamailio_issue_1703_1_normal

But when it's receiving a SIP packet from a public subnet, then it's just ignoring the packet completely.

kamailio_issue_1703_2_no_response

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